Might be thinking of Ninjutsu OS, which got a DMCA takedown in 2020 for distributing modified Windows installation ISOs "that heavily modify Windows 10 with a huge number of tweaks, mods and extra tools" for pentesting:

https://torrentfreak.com/removing-annoying-windows-10-featur...

Discussion: https://news.ycombinator.com/item?id=23486887

Complaint text: https://github.com/github/dmca/commit/e6911fbf79c67c6f9e834c...